OBD-II code · Powertrain (generic, extended)
P23A7 Exhaust Heat Exchanger Bypass Valve B Stuck Closed
Same as P23A6 with bypass valve B stuck closed - exhaust always passes through the heat exchanger.
Is it safe to drive with P23A7?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyValve stuck closed
- Less likelyCarbon or debris buildup preventing free movement
- Less likelyComponent wear with age - mechanical play
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1.5–4 h
- Emissions test
- Likely to fail
- Parts involved
- Exhaust Bypass Valve B
Related codes
- P23A4Exhaust Heat Exchanger Bypass Valve B Control Circuit High
- P23A5Exhaust Heat Exchanger Bypass Valve B Control Performance
- P23A6Exhaust Heat Exchanger Bypass Valve B Stuck Open
- P23A8Exhaust Heat Exchanger Bypass Valve B Position Sensor Stop Performance
- P23A9Communication Fault Forced Engine Shutdown
- P23AATurbocharger Bypass Valve A Stuck
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.